.animation-box {
    position: fixed;
    display: flex;
    bottom: 0;
    width: 100%;
    height: 100%;
    background: #fff;
    justify-content: center;
    /* align-content: center; */
    align-items: center;
    opacity: 0.9;
    z-index: 1000;
  }
  
  .yun-animation > span {
    display: inline-block;
    margin-left: 0.5em;
    width: 0.6em;
    height: 2.5em;
    animation-name: scale;
    /* 循环 */
    animation-iteration-count: infinite;
    /* animation-duration: 1.2s; */
  }
  
  @keyframes scale {
    0%,
    40%,
    100% {
      transform: scaleY(0.2);
    }
    20%, 60% {
      transform: scaleY(1);
    }
  }